DBS-C01 Deployment and Migration Practice Question
This DBS-C01 practice question tests your understanding of deployment and migration. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
An IAM policy is attached to a user who is deploying a new RDS instance. What is the effect of this policy on the user's ability to modify an existing production database instance with the identifier 'prod-mydb'?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The user cannot modify the production database instance because the Deny statement explicitly denies ModifyDBInstance on production databases.
The IAM policy includes an explicit Deny statement that denies the `rds:ModifyDBInstance` action when the resource condition matches `arn:aws:rds:*:*:db:prod-mydb`. In IAM, an explicit Deny overrides any Allow, so even though the Allow statement grants full RDS access, the Deny takes precedence and blocks modification of the production database instance with identifier 'prod-mydb'.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The user cannot modify the production database instance because the Deny statement explicitly denies ModifyDBInstance on production databases.
Why this is correct
Deny overrides Allow, and the resource pattern matches the production database.
Related concept
Read the scenario before looking for a memorised answer.
✗
The user can modify the production database instance because the Allow statement grants full access to RDS actions.
Why it's wrong here
The Allow statement does not include ModifyDBInstance, and the Deny explicitly denies it.
✗
The user can modify the production database instance if they use the AWS CLI instead of the console.
Why it's wrong here
IAM policies apply to all API calls, regardless of interface.
✗
The user cannot modify any database instance because the Deny statement denies ModifyDBInstance on all resources.
Why it's wrong here
The Deny only applies to resources matching the specific ARN pattern for production databases.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume an Allow statement with full access will override a Deny, but AWS IAM explicitly prioritizes Deny over Allow, and the Deny's resource condition restricts the effect to only the named production database, not all databases.
Detailed technical explanation
How to think about this question
IAM policy evaluation logic follows a default implicit deny, then explicit allows, and finally explicit denies—with explicit denies being absolute. The resource element in the Deny statement uses a wildcard `*` for region and account, but the database identifier `prod-mydb` is fixed, so only that specific instance is blocked. This is a common pattern to protect critical resources while allowing broad permissions for other actions.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Deployment and Migration — This question tests Deployment and Migration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The user cannot modify the production database instance because the Deny statement explicitly denies ModifyDBInstance on production databases. — The IAM policy includes an explicit Deny statement that denies the `rds:ModifyDBInstance` action when the resource condition matches `arn:aws:rds:*:*:db:prod-mydb`. In IAM, an explicit Deny overrides any Allow, so even though the Allow statement grants full RDS access, the Deny takes precedence and blocks modification of the production database instance with identifier 'prod-mydb'.
What should I do if I get this DBS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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